var how_many_ads = 4;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
 if (ad==1) {
txt="";
url="http://www.qksrv.net/click-1475244-3083829";
alt="Exercise";
banner="http://www.qksrv.net/image-1475244-3083829";
width="125";
height="125";
}
if (ad==2) {
txt="";
url="http://www.qksrv.net/click-1475244-10283437";
alt="diamond";
banner="http://www.qksrv.net/image-1475244-10283437";
width="125";
height="125";
}
if (ad==3) {
txt="";
url="http://www.qksrv.net/click-1475244-1481146";
alt="Digital";
banner="http://www.qksrv.net/image-1475244-1481146";
width="125";
height="125";
}
if (ad==4) {
txt="";
url="http://www.qksrv.net/click-1475244-7153884";
alt="Clarinet";
banner="http://www.qksrv.net/image-1475244-7153884";
width="125";
height="125";
}
//document.write('<center>');
//document.write('<a href=\"' + url + '\" target=\"_blank\">');
//document.write('<img src=\"' + banner + '\" width=')
//document.write(width + ' height=' + height + ' ');
//document.write('alt=\"' + alt + '\" border=0><br>');
//document.write('<small>' + txt + '</small>');
//document.write('</a></center>');